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Sikalastic®-844 XT

Chemical resistant pure polyurea membrane

Sikalastic®-844 XT is a two part, elastic, 100 % solids, very fast curing and coloured pure polyurea, liquid applied membrane with excellent chemical resistance. Suitable for use in hot and tropical climatic conditions.

  • Very fast reactivity and curing time
  • Almost immediate return-to-service time
  • Applicable in temperatures from -20°C to +50°C
  • Performs in constant dry temperatures from-30°C to +100°C
  • Good crack bridging properties
  • Excellent chemical resistance
  • Excellent abrasion resistance
  • UV light exposure may lead to yellowing and chalking
  • Resistant to biogenic sulphuric acid
 
Sikalastic®-844 XT
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Usage

Sikalastic®-844 XT is used as:
  • Abrasion resistant protective coating in industrial and manufacturing facilities
  • Tank, bund and pit lining in sewage and waste water treatment plants
  • Suitable for the use in areas with presence of biogenic sulphuric acid

Advantages

  • Very fast reactivity and curing time
  • Almost immediate return-to-service time
  • Applicable in temperatures from -20°C to +50°C
  • Performs in constant dry temperatures from-30°C to +100°C
  • Good crack bridging properties
  • Excellent chemical resistance
  • Excellent abrasion resistance
  • UV light exposure may lead to yellowing and chalking
  • Resistant to biogenic sulphuric acid
 

Packaging

Part A (Isocyanate)

209.8 kg drums ~189 L

Part B (Amine)

181.4 kg drums ~189 L

Colour

Part A

Clear

Part B

Grey

Grey, approximately RAL 7005

Product Details

Sustainability / Certifications / Approvals

SUSTAINABILITY

  • Conformity with LEED v4 MRc 2 (Option 1): Building Product Disclosure and Optimization – Environmental Product Declarations
  • Conformity with LEED v2009 IEQc 4.2: Low-Emitting Materials - Paints and Coatings

APPROVALS / CERTIFICATES

  • Coating for concrete protection according the requirements of EN 1504-2/2004, DoP 02 07 02 05 001 0000017, certified by FPC Notified Body and provided with CE-Marking
  • Kiwa Polymer Institute GmbH, report no. P7074-1, 2011, testing od static and dynamic crack bridging ability in accordance with DIN EN 1062-7, as well as bond strength after freeze-thaw-cycling with de-icing salt immersion and after thundershower cycling according DIN EN 13687-1 and -2, in combination with Sikafloor®-161
  • KB-Hoch, report no. 100591, 2010, Reaction to fire classification according DIN EN ISO 13501-1
Product Information

Composition

Pure polyurea

Shelf life

Part A: 12 month
Part B: 12 month

Storage conditions

The packaging must be stored properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C. Protected from direct sunlight.

Density

Part A

~1.11 kg/l

Part B

~0.96 kg/l

Density values determined at +23 °C

Solid content

~99 %

Viscosity

Temperature

Part A

Part B

+20 °C

~1700 mPas

~1700 mPas
Technical Information

Shore D Hardness

45–50

(DIN 53505)

Mechanical Resistance

~100 mg

H 22 / 1000 g / 1000 cy

~108 mg

H 17 / 1000 g / 1000 cy

Tensile Strength

> 10 N/mm²

(DIN 53504)

Crack Bridging Ability

Class A4

Static

Class B3.1

Dynamic

Chemical Resistance

Sikalastic®-844 XT is resistant to various chemicals. Contact Sika Technical Service for specific information.

Application

Application Information

Mixing Ratio

Part A : Part B = 1 : 1 (volume)

Layer Thickness

> 2 mm

Product Temperature

> +65 °C

Ambient Air Temperature

+1 °C min. / +40 °C max.

Relative Air Humidity

< 85 %

Dew Point

The substrate and the uncured membrane must be at least +3 °C above dew point to reduce the risk of condensation. Beware of condensation.

Substrate Temperature

+1 °C min. / +50 °C max.

Substrate Moisture Content

≤ 4 % pbw moisture content.

Test method: Sika®-Tramex meter, CM - measurement on Oven-dry method

No rising moisture according to ASTM (Polyethylene-sheet)

Curing Time

24 h / +20 °C

Gel time

~10 s / +20 °C

Waiting Time / Overcoating

Temperature

minimum

maximim

+10 °C

~1 minute7 hours

+20 °C

~1 minute6 hours
+30 °C~1 minute6 hours
Consumption

Consumption

~1.08 kg/m²/ mm
Application steps

SUBSTRATE PREPARATION

The surface must be sound, of sufficient strength, clean, dry and free of dirt, oil, grease and other contamination.
Depending on the material the substrate must be primed or mechanically cleaned.

Grinding may be necessary to level the surface. Suitable substrates
are such as: Concrete and metal.

Substrate Pre-Treatment

Substrate

Primer

Consumption [mL/m2]

Cementitious substratesSikafloor®-161 lightly broadcast with quartz sand, 0.3 - 0.8. Example SikaDur®-507~200 – 300

MIXING

Dose and mix with a suitable air driven or electrical plural component heated spray equipment. Both components must be heated up to the temperatures given in the related Product Data Sheet. The accuracy of mixing and dosage must be controlled regularly with the equipment. Thoroughly stir part B (Amine) using a drum stirrer until a homogenous colour is obtained.

APPLICATION

Sikalastic®-844 XT is spray applied in a continuous spray application to achieve a homogeneous film.

CLEANING OF EQUIPMENT

Clean all tools with Thinner C immediately after use. The application equipment has to cleaned and filled with Mesamoll. Hardened and/or cured material can only be removed mechanically.

 

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